JPS5811558B2 - Packing material consisting of a foil-like material with flow surfaces for "troughs" for mass and heat exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filler consisting of a foil-like material with a flow surface for baths for the exchange of substances and heat between two fluid media, in particular between a liquid and a gas. .

The column packing can consist of a large number of bulk packed, identical packing materials, for example Luschig rings, or the mounting can be constructed from elements with an aligned structure, also referred to as backing material.

The invention is based on the problem of promoting mass and heat exchange through a suitable formation of flow surfaces in a filler made of foil-like material.

This problem is solved according to the invention in that the flow surface has alternating smooth and corrugated sections, the lateral sections each extending over a height of at least 5 mm. .

In the present invention, wavy grooving refers to the raising of the surface of a thin plate by guiding grooves or by carving a pattern such as a fishbone pattern, for example.

When a mounting with an aligned structure forms a filler as an element, smooth sections and sections with micro-wavy grooves are arranged alternately on the flow surface in the direction of the flow line of the liquid.

The mounting consists of contacting, creased thin plates arranged parallel to the basic axis and the microcorrugated grooved part consists of a guiding groove, if the microcorrugated grooved part consists of a guiding groove. preferentially forms an angle with the cardinal axis having the opposite prefix of the corresponding corner of the fold.

For elements whose mounting consists of a creased flow surface,
The liquid mainly flows through the valley bottom formed by the folds,
That is, canalization of the liquid occurs and the liquid does not flow uniformly on the flow surface.

When forming a minute wave-type groove as a guide groove, the guide groove can extend in a horizontal direction.

However, according to an advantageous embodiment of the invention, the angle between the microchannel and the basic axis is between 15 and 90°, and the angle between the fold and the basic axis is in the range of approximately 15-60°. be.

In this case, the lateral expansion of the liquid on the flow surface is further enhanced by the shear forces prevailing in the flow troughs.

In all filler types covered by the invention, the following process occurs: The liquid flows down as a film on the flow surface.

Mass and heat exchange from the gas phase into the liquid film,
Or by the opposite process of diffusion.

These processes are explained by the so-called two-film theory (Zwei-
Filmtheorie).

The time required for a molecule to pass from the core of the gas stream into the core of the liquid consists of two partial steps.

First the molecules reach the phase interface from the core of the gas stream.

In the second step the molecules pass from the phase interface into the liquid core.

According to the invention, the second step is entirely facilitated.

The thickness of the liquid film is much thicker on the part of the flow surface with fine wavy grooves than on the smooth part, in which case no film is formed on the smooth part, and the thin It creates a flow.

As liquid moves from one area to another, the film thickness changes and new liquid surfaces are created.

Particles then move from the flow of the liquid core to the surface or vice versa.

This mechanical movement is several times faster than the movement of molecules due to diffusion.

Differences in concentration or temperature are thereby compensated for by the rapid movement of the individual liquid particles and not simply by diffusion.

Mass or heat exchange is thereby improved.

The present invention will be explained in detail below with reference to embodiments of the drawings.

The flow surface 1 in FIG. 1 has a rough fold with a cusp 2a and a trough 2b.

The concept of scoring refers to tooth-shaped and wave-shaped cross-sectional formations in the present invention.

The flow surface, which can be made of metal, for example copper, stainless steel or Monel alloy or plastic, is divided perpendicular to the basic axis into alternating smooth and micro-corrugated sections 3 and 4.

The microgroove 5 is arranged in the part 4 at an angle opposite to the angle of inclination of the fold.

Advantageously, the length of the corrugated grooves and the height of the corrugated grooves measure 0.3-3 mm.

Advantageously, the angle between the microgroove and the cardinal axis is 15-90°, and the angle between the fold and the cardinal axis is 15-60°, the former angle being equal to the latter angle. have opposite prefixes.

The smooth part 3 is provided with a number of holes 6.

Advantageously, the holes have a diameter of approximately 4 mm and in total do not occupy more than 5-20% of the total flow surface.

The embodiment of the flow surface represented in FIG.
Consistent with the diagram.

Figure 3 shows a smooth part 3' and a part 4 with minute wave-shaped grooves.
' shows an embodiment of the flow surface which is arranged not perpendicularly but at an angle to the base axis.

FIG. 4 graphically shows a flow diagram in the developed flow plane, and FIG. 4a shows a side view along the cross-sectional line ``a''--``a'' in FIG. 4.

The part 3'' has micro-corrugated grooves 5", while the part 4" has a smooth surface and, like the micro-corrugated part, has several holes 6".

The flow diagram shows that the liquid flows down through the section 3'' as a film, while on the smooth section the liquid flows in streams and is guided at least partially laterally by the holes 6''.

FIG. 5 shows a flow surface 1 that can be formed in FIGS. 1 to 3. In FIG.

The flow surfaces are connected and cascaded and one fitting is shown in the order in which it is merged into the element and then installed in the replacement part of the cylindrical column, where the fittings are connected to the flow surfaces forming the element. Only a portion of is represented.

The mounting elements could also consist of parallel, unscorched flow surfaces, in which case the distance between adjacent layers would be ensured by spacers in a known manner.

Fig. 6 shows a band 7 that is wound into a coil shape and forms a fluid surface bent into a fishbone shape for the production of a coil molded body.
shows a perspective view.

The flow surface is divided into a micro-wavy grooved section 3 and a smooth section 4.

The coiled body can also consist of an unscored band, in which case the distance between adjacent layers is maintained by spacers in a known manner.

In FIG. 7, it has a part 9 with minute wavy grooves and a smooth part 10, and the smooth part has holes 11.

The packing 8, which is designed as a Luschig ring, represents a packing used in columns in which the mass or heat exchange part contains bulk packings of this type.

The filler could also have other configurations known as bulk fillers, such as saddles, rings with webs, etc.

In FIG. 8, one section 15 of the replacement part of the column 16 is represented,
These parts are each arranged 3
The installation includes elements 17, 18, and 19.

In this case the mounting element consists of a layer of flow surface formed according to the invention.

(See Figure 5).

The mounting is such that in the lower part of the element a guiding element 20 in the form of a collar is fixed, which closes the annular gap between the packing material and the column wall and directs the liquid flowing down along the inner wall. The attachment acts inwardly on the underside of the element.

Mounting of such collars can also be arranged at various heights of the element.

The lowermost attachment connects to the element, and this attachment terminates in a cusp 21 on the lowermost side of the lamina of the element in order to guide the liquid evenly distributed over the column cross-section into the evaporation section of the column.

Of course, the column 16 can also be loaded with a coiled body of the type described above as a mounting element or bulk filler.

In the case of large column diameters, for example 1 m and more, the installation element can consist of several parts arranged one after the other.

These individual parts are held together by external waves.

[Brief explanation of the drawing]

1 is a perspective view of the flow surface, FIG. 1a is an enlarged view of a detail of the flow surface, FIGS. 2 and 3 are views of other embodiments of the flow surface, FIG.
The figure shows the diagram of the flow band for the developed flow surface, Figure 4a is a side view along the cross-sectional line ■a-■a in Figure 4, and Figures 5, 6, and 7 are parallel flow surfaces. Figure 8 is a perspective view of the element; The three fittings formed according to the above designate part of the tower containing the elements. Explanation of main symbols in the drawings: 1: Flow surface, 2a: Point angle, 2b
: Valley bottom, 3,3', 3'', 10: Smooth part, 4.4'
, 4″, 9: Microwave grooved part, 6.6″, 11:
Hole, 8: Filler, 16: Tower, 17° 18.19: Mounting element.

Claims (1)

Claims: 1. A filling consisting of a foil-like material with a flow surface for baths for the exchange of substances and heat between two flowable media, in particular between a liquid and a gas, wherein said flow surface is Filling material characterized in that it has alternating smooth sections and sections with finely corrugated grooves, the lateral sections extending over a height of at least 5 mm. 2. In the filler described in claim 1,
A filler characterized in that the flow surface is perforated at least in the smooth portion. 3 In the filler described in claim 1,
A filling material characterized in that the fine wave-shaped grooves described above are composed of grooves. 4 In the filler described in claim 1,
When a mounting with an aligned structure forms a filler as an element, the smooth part and the part formed with the fine wavy grooves on the flow surface alternate in the direction of the flow line of the liquid. A filling material characterized by being arranged in.